The Stop task button is only visible after starting the task — i.e. after at least one interaction on the screen. This prevents testers from giving up without attempting to complete the task.
Stop a task on desktop prototypes
When testing mobile prototypes on desktop screens, the Stop task button is displayed after starting the task — i.e. after clicking the Get started button to start the task, then clicking the prototype screen at least once.
When testing mobile prototypes on desktop screens, the End task button is displayed in the small instructions panel.
Stop a task on mobile devices
At the beginning of a prototype test on a mobile device, a panel with the task controls is displayed at the bottom.
To hide the panel in order to see the full screen, click Hide instructions.
If testers get stuck after starting the task, clicking the Show instructions button () at the bottom left of the screen will reveal the instructions again, as well as the Stop task button.